Source file requires different compiler version : Truffle

Question

I have written one simple smart contract in solidity and trying to migrate it with truffle.

$ truffle migrate
Compiling .\contracts\Election.sol...
Compiling .\contracts\Migrations.sol...

    /D/ethereum/electiondemo/contracts/Migrations.sol:1:1: SyntaxError: Source file requires different compiler version (current compiler is 0.5.0+commit.1d4f565a.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
    pragma solidity ^0.4.24;
    ^----------------------^

Compilation failed. See above.`enter code here`
Truffle v5.0.0 (core: 5.0.0)
Node v8.11.1

Solidity version is 0.5.0. Please find below the code for the smart contract:

pragma solidity ^0.5.0;

contract Election {
    // Read/write candidate
    string public candidate;

    // Constructor
    constructor ( ) public {
        candidate = "Candidate 1";
    }
}

score 17 · Answer 1 · edited Jan 27 '21 at 09:16

Got the solution : In truffle.js. You need specify solidity version

module.exports = {
   // See <http://truffleframework.com/docs/advanced/configuration>
   // for more about customizing your Truffle configuration!
   networks: {
       development: {
           host: "127.0.0.1",
           port: 7545,
           network_id: "*" // Match any network id
       }
   },
   compilers: {
       solc: {
           **version: "0.4.24"** // ex:  "0.4.20". (Default: Truffle's installed solc)
       }
   }
};

Same need to given in your smart contract

score 11 · Answer 2 · edited Sep 07 '20 at 07:16

11

Add the below line to truffle-config.js

{
  compilers: {
    solc: {
      version: "0.4.24" // ex:  "0.4.20". (Default: Truffle's installed solc)
    }
  }
}

edited Sep 07 '20 at 07:16

Adam Azad

11,171
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answered Jan 08 '19 at 20:54

Prashant Kajale

473
4
8

score 3 · Answer 3 · answered Jul 10 '21 at 20:56

As of now, truffle uses '0.5.16' as default. So if your code is using newer solidity versions, it would throw an error. you do not need to put a specific value for the solc version.

this is what I use on the contract

 pragma solidity >=0.7.0 <0.9.0;

in the config file

compilers: {
    solc: {
      // default is 0.5.16
      version: ">=0.7.0 <0.9.0",    // Fetch exact version from solc-bin (default: truffle's version)
    
      }
    }
  },

score 0 · Answer 4 · answered Jan 07 '19 at 17:04

0

Your migration contract (Migrations.sol) needs 0.4.24.

Go to your migration contract and change your dependency to 0.5 or change your main contracts dependency to 0.4.*

answered Jan 07 '19 at 17:04

Ferit

8,692
8
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score 0 · Answer 5 · answered Dec 04 '20 at 10:49

to your truffle.js / truffle-config.js add this

module.exports = {
// See <http://truffleframework.com/docs/advanced/configuration>
// for more about customizing your Truffle configuration!
networks: {
  development: {
    host: "127.0.0.1",
    port: 7545,
    network_id: "*" // Match any network id
  }
},
compilers: {
  solc: {
    version: "0.4.24" //(Default: Truffle's installed    solc)
  }
 }
};

Then use npx to run your packages. npx is a native npm package, so it comes with your installation of nodejs & npm. It allows you to run local node package binaries. This way, you can get rid of a lot of your global package installations, and use the local binaries that are defined in your package.json.

npx truffle compile

npx truffle test (optional)

npx truffle migrate

Source file requires different compiler version : Truffle

5 Answers5